Pneumatic tire.



H. R. KRASTEL.

PNEUMATIC-TIRE. I

APPLICATION Hum we. 4, 1909.

PatentedJan. 10, 1911.

HANS REIMAR KRASTEL, 0F DARMS'I ADT, GERMANY.

PNEUMATIC TIRE.

seiner.

Specification of Letters Patent.

Patented Jan.-10, 1911.

Application filed August 4, 1909f Serial No. 511,140.

To all whom it may concern:

Be it known that I, HANS RmMJAR Kans- TEL, subject of the Grand Duke ofHesse, residing in Darmstadt, Grand Duchy of Hesse, in the Empire ofGermany, engineer, have invented certain new and useful Iniprovements inPneumatic Tires, for which application has been made in Germany, datedAugust 4;, 1908; Great Britain, dated August 21, 1908; Austria-Hungary,dated August 19, 1908; Switzerland, dated August 18, 1908; France, datedAugust 21, 1908, and Belgium, dated August 27, 1908.

The ordinary pneumatic tires for wheels have hitherto been made entirelyof material giving the actual adhesion and also receiving the pressure,consisting of a canvas cover which is stuck together in various layersby the vulcanization of rubber. Now it has been found that under thevery great strains, caused on the one hand by the load to be carried andon the other hand by the action of the operating motor, that it is nptpossible to make a tire of canvas layers which permanently afi'ordsabsolute safety. The 'diliiculty more particularly consists inmaintaining the separate canvas layers permanently in their relativeposition. Efforts have also been made to make the pneumatic tire by notemploying a fabric, but of cords twisted together and impregnated withrubher. This method of manufacture is however very difficult and alsothedrawbacks, which the use ofvegetable fibers in itself involves, are.not removed.

New this invention has for its object to niakethe part of the pneumatictire directly sustaining the pressure of metal.

The employment in pneumatic tires of in sertions of metallic fabric orthe like, either directly embedded in the cover or as a protective layerbetween the cover and the air tube is well known. In all thisconstructionv however the elasticity of the metal is-a-ffected, and ithas been found-that no metal is adapted to endure the extremely numerousflexiops Without rapid alteration of struc ture, and moreover it veryrapidly breaks. Protective inlays have also been constructed which werecomposed of interengaging metal parts, rings, plates and the like. Thesecannot however come into considera tion at all for the present object,because the separate members do not possess sufiicient relative freedomof motion. Inparticular they do not allow any diagonal movement, andtherefore their use as a covering insertion is excluded.

The present invention consists of a pneumatic tire in. which the part ofthe pneumatic tire directly sustaining the pressure consists of chainlinks which are so engaged with one another that a mobility is obtainedexactly as full and complete as with a canvas fabric.

The invertion will be now described with reference to the accompanyingdrawings, in which: In the form of construction shown in Figure 1,longitudinal chains a and cross chains 6 are provided. The latter runthrough the former chains which is easily obtainable with a correctarrangement of the respective links of the chains. In the almost similarform of construction shown in Fig. 2, short chains a, 6 run transverselyover one another from one side to the other. Fig. 3 is a section of thetire as a whole.

The method of the embedding is also immaterial as regards the invention.rubber, as well as leather, prepared felt and the like may equally beemployed, and the method of embedding may also be effected.

in various ways.

Having now particularly described the nature of my said invention and inWhat manner the same is .to be constructed,

I declare that what I claim is:

In a pneumatic tire, an embedded chain work, comprising crosswise.extending strands, which run through one another and are freely movablewithin one another.

In testimon whereof I affix my signature in presence 0 two witnesses.

HANS REIMAR. KRAs'rnL.

Witnesses J EAN GRUND, CARL GRUND.

India-'

